For a typical flowering plant, how is the first cell of the triploid (3n) endosperm formed from?
a. from one sperm fused with two antipodal cells
b. from two sperm fused with a synergid
c. from one sperm fused with the central cell
d. from two sperm fused with the egg
Answer: c. from one sperm fused with the central cell
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What can scientists study to gain a better understanding of prokaryotic life on Earth millions—if not billions—of years ago?
A. microfossils of bacteria B. stromatolites and sediments C. carbon isotopes in limestone D. molecular (lipid) fossils E. All of these answer options are correct.
What stimulates milk production in mammary alveoli?
A. oxytocin B. prolactin C. chorionic gonadotropin D. progesterone E. estrogen
Compare and contrast the steps of viral multiplication cycles in bacteriophages and animal viruses.
What will be an ideal response?
Griffith, a British microbiologist, used bacteria and mice to demonstrate the process of transformation. During transformation,
A. genetic material is transferred from one bacterial cell to another. B. a bacterial chromosome produces an exact copy of itself. C. the nucleus of a mouse cell repairs itself when damaged by bacterial infection. D. a bacterial cell is transformed into a spore during unsuitable environmental conditions. E. DNA from an infected mouse cell changes bacteria from a nonpathogenic to a pathogenic form.