MCAT Biology Practice Questions WITH ANSWERS

MCAT Biology Practice Questions WITH
ANSWERS
Hyperbaric oxygen may be used as a treatment for certain types of bacterial infections. In
this therapy, the patient is placed in a which the partial pressure of oxygen is significantly
increased, increasing the partial pressure of oxygen in the patient's tissues. This treatment is
most likely used for infections with:



A. obligate aerobic bacteria

B. facultative anaerobix bacteria

C. aerotolerant anarobic bacteria

D. obligate anaerobic bacteria - **🔰 VERIFIED ANSWERS🔰 ✔✔D



Which of the following does NOT describe connective tissue cells?



A. They account for most cells in muscles, bones, and tendons

B. They secrete substances to form the extracellular matrix

C. in organs, they tend to form the stroma

D. In organs, they provide support for epithelial cells - **🔰 VERIFIED ANSWERS🔰 ✔✔A



Which of the following types of nucleic acid could form the genome of a virus?

I. Single-stranded RNA

II. Double-stranded RNA

III. Single-stranded DNA



A. I only

B. II only

C. I and II only

,D I, II and III - **🔰 VERIFIED ANSWERS🔰 ✔✔D



Which of the following activities occurs in the Golgi apparatus?



A. Synthesis of proteins

B. Modification and distribution of proteins

C. Breakdown of lipids and carbohydrates

D. Production of ATP - **🔰 VERIFIED ANSWERS🔰 ✔✔B



Mitochondrial DNA is:

I. circular

II. self-replicating

III. single-stranded



A. I only

B. II only

C. I and II only

D. I, II and III - **🔰 VERIFIED ANSWERS🔰 ✔✔C



Which of the following is NOT a function of the smooth endoplasmic reticulum?



A. Lipid synthesis

B. Poison detoxification

C. Protein synthesis

D. Transport of proteins - **🔰 VERIFIED ANSWERS🔰 ✔✔C



What is the main function of the nucleolus?

,A. Ribosomal RNA synthesis

B. DNA replication

C. Cell division

D. Chromosome assembly - **🔰 VERIFIED ANSWERS🔰 ✔✔A



Which of the following organelles is surrounded by a single membrane?



A. Lysosomes

B. Mitochondria

C. Nuclei

D. Ribosomes - **🔰 VERIFIED ANSWERS🔰 ✔✔A



Which of the following is NOT a difference that would allow one to distinguish a
prokaryotic and a eukaryotic cell?



A. Ribosomal subunit weight

B. Presence of a nucleus

C. Presence of a membrane on the outside surface of the cell

D. Presence of membrane-bound organelles - **🔰 VERIFIED ANSWERS🔰 ✔✔C



Which of the following does NOT contain tubulin?



A. Cilia

B. Flagella

C. Microfilaments

D. Centrioles - **🔰 VERIFIED ANSWERS🔰 ✔✔C

, Herpes simplex virus (HSV) enters the human body and remains dormant in the nervous
system until is produces an outbreak after exposure to heat, radiation, or other stimuli.
Which of the following statements correctly describes HSV?



A. While it remains dormant in the nervous system, the virus is in its lytic cycle

B. During an outbreak the virus is in the lysogenic cycle

C. Herpes simplex virus adds it genetic information to the genetic information of the cell

D. The herpes simplex virus contains a tail sheath and tail fibers - **🔰 VERIFIED
ANSWERS🔰 ✔✔C



Resistance to antibiotics is a well-recognized medical problem. Which mechanism(s) can
account for a bacterium's ability to increase its genetic variability and thus adapt itself to
resist different antibiotics?

I. Binary Fission

II. Conjugation

III. Transduction



A. I and II only

B. I and III only

C. II and III only

D. I, II and III - **🔰 VERIFIED ANSWERS🔰 ✔✔C



A bacterial cell is noted to be resistant to penicillin. The bacterium is transferred to a colony
that lacks the fertility factor, and the rest of the colony does not become resistant to
penicillin. However, the penicillin-resistant cell has started to exhibit other phenotypic
characteristics, including secretion of a novel protein. Which of the following methods of
bacterial recombination is NOT likely to account for this change?



A. Conjugation