The primates first arose about how many million years ago?
a. 30
b. 40
c. 50
d. 60
e. 70
ANSWER: d
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Over evolutionary time, photosynthesis has effectively poisoned itself by producing an oxygenic atmosphere because __________
A. rubisco is an oxygenase B. rubisco is a carboxylase C. O2 is a strong oxidant D. rubisco is an oxygenase and O2 is a strong oxidant E. rubisco is an oxygenase and O2 is a strong reductant
The purpose of the Calvin cycle is to ____
a. convert inorganic carbon into a useable form of carbon b. recover electrons lost when water was split c. capture photons of light to harvest solar energy d. counteract increasing atmospheric CO2 concentrations (global warming) e. generate the O2 gas required for cellular respiration
What is the function of the prostate secretions?
a. sperm maturation b. to provide sperm with energy c. to protect sperm from vaginal acidity d. to stimulate the release of LH e. to increase sperm motility
Which of the following is not a chemical group to which hormones can be assigned?
a. steroid hormones b. polysaccharide hormones c. amino acid derivatives d. peptide hormones e. fatty acid derivatives