OAT General Biology 5

Question 1

Which of the following correctly describes the role of telomeres?

Accepted Answer

They protect chromosome ends from degradation and fusion

Answer

Telomeres are repetitive non-coding DNA sequences that cap chromosome ends, preventing degradation and end-to-end chromosome fusions during each cell division.

Question 2

A species of insect evolves mimicry of a toxic species even though it is harmless. This is an example of:

Accepted Answer

Batesian mimicry

Answer

Batesian mimicry occurs when a harmless species evolves to resemble a harmful or toxic species, gaining protection from predators.

Question 3

Which layer of the skin contains melanocytes that produce melanin?

Accepted Answer

Stratum basale

Answer

Melanocytes are located in the stratum basale (deepest epidermal layer) and produce melanin that is transferred to surrounding keratinocytes for UV protection.

Question 4

What is the primary role of the corpus luteum after ovulation?

Accepted Answer

Secrete progesterone to maintain the uterine lining

Answer

The corpus luteum, formed from the ruptured follicle after ovulation, secretes progesterone (and some estrogen) to maintain the endometrium for potential implantation.

Question 5

Which of the following describes an r-selected species?

Accepted Answer

Short lifespan, many offspring, little parental care

Answer

r-selected species maximize reproductive rate (high r) by producing many offspring with minimal parental investment, thriving in unpredictable environments.

OAT - Optometry Admission Test Practice Test

OAT - Optometry Admission Test Practice Test

OAT General Biology 5