Which of the following structures gives rise to endosperm?
A. Zygote formed from the fusion of a sperm and an egg
B. Triploid cell formed during double fertilization
C. Inner wall of the ovary
D. Cytoplasm of the megaspore
E. Cytoplasm of the microspore
Answer: B
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Which viruses have single-stranded RNA that acts as a template for DNA synthesis?
A) lytic phages B) proviruses C) viroids D) bacteriophages E) retroviruses
The possible effect of failing to limit greenhouse gas emissions on the oceans is likely to be which of the following?
A. An increase in dissolved carbon dioxide will raise the pH. B. An increase in dissolved methane will stimulate microbial growth. C. An increase in dissolved carbon dioxide will lower the pH. D. An increase in dissolved methane will hinder microbial growth.
To infect a cell, HIV must
A. bind both CD4 and a cytokine co-receptor. B. bind both CD8 and a cytokine co-receptor. C. bind both CD8 and a class I MHC protein. D. kill cytotoxic T cells and bind CD4.
Oxytocin secretion causes
a. delivery of the infant. b. delivery of the placenta. c. the release of milk when a newborn suckles. d. postdelivery uterine contractions that help shrink the organ to prepregnancy size. e. all of these