How many cells are in the female gametophyte of a flowering plant?
a. 4
b. 6
c. 7
d. 8
Answer: c. 7
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Many plant defense compounds are used in human medicine
A. true B. false
Alanine and lysine are both amino acids. Not eating enough lysine can lead to protein deficiency, whereas not eating enough alanine does not lead to protein deficiency. Why is this the case?
A. Alanine can be synthesized by cellular biochemical pathways, whereas lysine cannot. B. Alanine can be easily replaced by other amino acids in protein synthesis, whereas lysine cannot. C. Lysine is needed in much larger quantities for protein synthesis than alanine. D. The body has a more difficult time absorbing lysine than alanine, so more must be consumed to avoid protein deficiencies. E. All of the answer options are correct.
Which statement about whisk ferns is FALSE?
a. They exhibit dichotomous branching. b. One representative is Psilotum. c. They lack true leaves. d. They lack true roots. e. They lack true stems.
Which pathogen below has been completely eradicated from the human population due to vaccination programs?
a) Measles b) Mumps c) Small Pox d) Polio