Normal blood pressure is 120/80. What is the top number called and what is happening in the heart?
A. diastolic pressure; ventricles are relaxing
B. systolic pressure; ejection of blood from the heart
C. diastolic pressure; atria are contracting, ventricles are relaxing
D. diastolic pressure; ejection of blood from the heart
E. systolic pressure; ventricles are relaxing
Answer: B
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Explain how using a combination of two antimicrobial drugs helps prevent the development of spontaneously resistant mutants
A. All drugs work synergistically with each other-that is, their combined effects are far greater than either could achieve individually. Two drugs together helps to eliminate microbes, even if they have developed spontaneous mutations that would confer upon them resistance to the drugs. B. It is highly unlikely that the microbe might spontaneously develop two specific mutations to resist the effects of a pair of drugs. As such, even if one drug is resisted by the microbe, the second drug will eliminate the mutated microbe, thus preventing the development of spontaneously resistant mutants overall. C. All drugs work antagonistically with each other-that is, their combined effects are far greater than either could achieve individually. Two drugs together helps to eliminate microbes, even if they have developed spontaneous mutations that would confer upon them resistance to the drugs. D. Drugs can also select for mutations that will enhance the activity of another drug. So, each of the paired drugs will help to select for spontaneous mutations that enhance the activity of the other drug in the pair.
In the light-dependent reactions of photosynthesis, how do hydrogen ions get back into the stroma?
a. passive diffusion directly across the thylakoid membrane b. active transport across the thylakoid membrane c. facilitated diffusion across the thylakoid membrane d. active transport through ATP synthase e. passive diffusion through ATP synthase
When does fertilization occur in flowering plants?
A) Pollen grains land on the anthers of the female flower parts. B) The female carpels and male anthers are united. C) Sperm join with eggs inside the ovules. D) Pollen joins with eggs inside the stigma.
Vitamin B9 regulates synthesis of (A)_________ , and its deficiency leads to defects in (B)_____________.
a. (A) dTTP, (B) DNA synthesis b. (A) dCTP, (B) mitosis