A particular cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane, and mitochondria. It could be a(n) ________ cell
A) bacterial
B) plant or bacterial
C) plant, but not an animal
D) animal, but not a plant
E) plant or animal
E
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Humans are susceptible to scurvy because
A. they do not have enough adipose tissue for vitamin A storage. B. they cannot synthesize vitamin C. C. they have a high incidence of fruit allergies. D. constant seasickness and nausea on long voyages leads to weakness and anemia. E. they cannot synthesize amino acids.
The number of initiations of transcription from a promoter that has the sequence 5'-TAGCAT-3' will be greater than the number of initiations from a wild-type promoter
Indicate whether the statement is true or false
During receptor-mediated endocytosis, ____.
A. plasma membrane receptors bind molecules to be expelled B. a small channel forms beneath the receptors C. a pit opens inside a cell D. a vesicle forms E. a vesicle is destroyed
The genomes of viruses are very small because
A. small genomes are an adaptation that allows for faster copying. B. viruses have evolved only recently. C. of codon bias D. Both small genomes are an adaptation that allows for faster copying and many viruses utilize the molecular machinery of their host cells. E. many viruses utilize the molecular machinery of their host cells.