Breathing rate increases during exercise because 

A. the heart is beating more rapidly.
B. there is less oxygen in the blood.
C. there is more carbon dioxide in the blood.
D. there is an increase in blood pH.


C. there is more carbon dioxide in the blood.

Biology & Microbiology

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You are a doctor who examines a swollen and warm puncture wound on the hand of a patient. Because the wound was made by a rusty nail, you are concerned about infection by Clostridium tetani bacteria, which cause tetanus

You are relieved to see that the patient received a tetanus vaccine at her last checkup. The vaccine ____________. A. exposed the patient to C. tetani so that she contracted a mild version of tetanus. B. exposed the patient to deactivated C. tetani, so that her B cells would produce antibodies to the bacteria with minimal risk of contracting the disease. C. stimulated the production of mast cells by her bone marrow. D. exposed the patient to other types of bacteria, so that her immune system would be prepared for infection by prokaryotes.

Biology & Microbiology

The production of gastric juice is an example of what

digestive system task? a. mechanical processing b. secretion c. digestion d. absorption e. elimination

Biology & Microbiology

Regarding the structure of DNA, the covalently arranged combination of a deoxyribose and a nitrogenous base would be called a(n) ________

A) ribonucleotide B) monophospate nucleoside C) nucleotide D) oligonucleotide E) nucleoside

Biology & Microbiology

Which of the following statements concerning fertilization is false?

a. Fertilization restores the diploid chromosome number. b. Fertilization stimulates the initiation of development. c. Fertilization can determine the sex of the offspring. d. Fertilization permits the formation of gametes with new genetic combinations. e. In fertilization, a sperm fuses with an ovum to produce a zygote.

Biology & Microbiology