TEAS 7 Science Exam Questions and Answers
34. Which of the following layers of skin contains glands and hair follicles? A. Stratum
D. Stratum lucidum: B. Dermis
35. Carbohydrates are composed of which of the following? A. Monosaccharides
B. Amino acids
C. Nucleic acids
D. Isoprenoids: A. Monosaccharides
36. Identify the pathway of blood through the components of the cardiovas- cular system,
starting with the blood entering the heart through the superior vena cava. (Move the options
in the box on the right, placing them in selected order. Use all the options.)
Pulmonary artery: Right Atrium
Right Ventricle Pulmonary valve Pulmonary artery Lungs
37. Which of the following is an example of active transport?
A. Movement of sodium and potassium across the cell membrane against their
B. Loss of water from a cell in a hypertonic solution.
C. Aquaporins in kidney cells that help concentrate urine.
D. Movement of a substance from an area of high concentration to an area of low
concentration.: A. Movement of sodium and potassium across the cell membrane against their
the rest are passive
38. A vasectomy is a procedure in which the vas deferens are cut. Which of the following
describes why a vasectomy leads to infertility?
A. The vasectomy blocks the movement of sperm from a testis into the epididymis.
B. The vasectomy blocks the movement of sperm from the ejaculatory duct into the
C. The vasectomy blocks the movement of sperm from the prostate gland to the
D. The vasectomy blocks the movement of sperm from the epididymis to the urethra.: D. The
vasectomy blocks the movement of sperm from the epididymis to the urethra.
(The sperms are produced in seminiferous tubules which are then matured and stored in
epididymis. From epididymis it flows to vas deferns and then to urethra upon ejaculation)
39. Which of the following is true if Koch's postulates are met regarding a disease?
A. This disease is noninfectious
B. The disease is hereditary
C. The disease is caused by a microorganism
D. The disease is he result of a dietary deficiency: A. This disease is noninfec- tious
(Koch's postulates are four criteria designed to establish a causal relationship between a microbe
and a disease)
1. The microorganism must be found in abundance in all organisms suffering from the disease, but
should not be found in healthy organisms.
2. The microorganism must be isolated from a diseased organism and grown in pure culture.
3. The cultured microorganism should cause disease when introduced into a healthy organism.
4. The microorganism must be reisolated from the inoculated, diseased experimen- tal host and
identified as being identical to the original specific causative agent.
40. Which of the following statements about COVID-19 vaccine initiation is supported by
the data in the chart below?
A. The highest daily rate occurred in December.
B. The cumulative total fell by 2 million between January 9 and January 10. C. The daily
rate for December 29 and January 5 are similar.
D. The cumulative total for January is around 13 million.: C. The daily rate for
December 29 and January 5 are similar.
41. A student investigating the importance of wavelengths above and below the visible
spectrum for photosynthesis sets up an experiment as followers over a 2-month period, all
with illumination at 1 meter distance from plants grown with the same soil and watering
3 Arabidopsis plants exposed to ultraviolet light(uv)
3 Arabidopsis plants exposed to infared light (IR)
3 Arabidopsis plants exposed to white light
at the end of the experiment, she first finds that The IR treated plants, are
scorched, the uv treated plants have wilted, but the white light-treated plants are growing
Which of the following statements is most likely correct?
a) Three plants do not provide sufficient replications to draw a conclusion. b) The
wavelength of light does not affect photosynthesis
c) Infrared light contains more energy than other wavelength
d) Wavelength of light is the only variable that has been changed between groups: d)
Wavelength of light is the only variable that has been changed between groups
42. In the image above, identical genes (A and B) flank the tet^R gene on Plasmid 1 and the
amp^R gene on Plasmid 2. If these two Plasmids success- fully exchange genes between
regions A and B, which of the following gene combinations is possible on the same plasmid?
A. kan^R + amp^R B. kan^R + tet^R
C. chl^R + tet^R
D. chl^R + kan^R: B. kan^R + tet^R
43. Mutations in which of the following types of cells can be inherited by offspring?
D. Ovarian: D. Ovarian
The offspring received the DNA only from the mother's ovarian germ cells and fa- ther's
testicular germ cells. Hence only ovarian mutation will result into inheritance.
44. Carbon has an atomic number of 6. Which of the following is true about the isotope C12?
45. During muscle contraction, myosin is directly responsible for which of the following?
A. Initiating an action potential along the sarcolemma. B. Forming cross-bridges with actin
C. Binding to troponin molecules.
D. Releasing calcium from the sarcoplasmic reticulum.: B. Forming
cross-bridges with actin molecules.
During muscle contraction, myosin is directly responsible for forming cross bridges with actin
molecules.Cross bridge formation and breaking help in contraction and relaxation of muscles.
46. A researcher collects high-resolution photographs of the Earth taken from outer space
at annual intervals for the last decade. This data would be most useful to analyze which of
A. Deforestation in the rainforest
B. Human movement during crisis
C. Weather patterns during hurricanes
D. Migration patterns of large whales: A. Deforestation in the rainforest
Deforestation is the process of removing large areas of trees, and its primary causes are increased
agriculture, wood harvesting, and the construction of new roads and other infrastructure. By
engaging in logging, farming, mining, and dam construction, humans can contribute to
deforestation. One can see deforestation via satellite because it gives a sharper picture of forest
disturbances and can monitor deforestation in different areas.
Option b is wrong since the population's mobility may be decreased during times of crisis when
human movements may be curtailed to stop the spread of disease. People are not visible from
space since they are unable to walk through the vast regions on Earth during the crisis.
Option c is wrong since a hurricane is a type of tropical cyclone that arises over tropical or
subtropical seas and rotates quickly. Rainfall from a typical hurricane might range from 6 inches
to a foot. Hurricanes can be observed from space, and the rotation of the earth also has an impact
on this process because the Coriolis effect causes the wind to move in a spiral pattern rather than
in a straight line. This results in the easily recognizable spiraling cloud system that can be seen in
satellite photos, but the weather pattern cannot be distinguished because of the continuous
movement of the clouds.
Option d is wrong since, during the summer, whales migrate toward the colder poles, and during
the winter, they move toward the warmer waters of the equator. Since whales spend most of their
time submerged, it is impossible to see their migration.
Because there are fewer trees because of deforestation, more carbon dioxide builds up in the
atmosphere. Global warming is caused by the atmosphere's excess
carbon dioxide, which traps heat rays that the earth reflects.
Therefore, deforestation can be measured in a variety of ways in the modern world. For instance,
researchers can utilize LiDAR or satellite photography to spot changes in global forest growth
47. Which of the following substances is excreted by sweat glands in re- sponse to the
breakdown of proteins and the formation of ammonia?
D. Sebum: A. Urea
Primary function of sweat glands is to maintain our body temperature during hot period by the
process of perspiration/sweating.
Now, in our body when proteins are broken down a significant amount of ammonia is produced.
These ammonia are toxic for our body so these are converted into urea, which are mainly
excreted by kidneys.
But some amount of urea is also excreted by sweat glands in the process of perspiration.
48. Which of the following body systems develop from the same origin tissues as lungs?
A. Musculoskeletal system B. Neuromuscular system C. Gastrointestinal system
D. Genitourinary system: C. Gastrointestinal system
LUNGS or the respiratory system is developed from the endoderm layer of the 3 germ layers.
Gastrointestinal system is also formed from the endoderm layer. Whereas, genitourinary system
is formed from the mesoderm. Nervous System is formed from ectoderm.
Musculoskeletal System is formed from the mesodermal layer. Hence the answer is
49. Which of the following pancreatic secretions digests starch into disac- charides?