The polysaccharide that strengthens plant cells is called
a) sucrose
b) cellulose
c) glucose
d) galactose
Ans: b) cellulose
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While the gene encoding the small subunit of ribosomes was used to generate the universal tree of life,
many genes are inappropriate choices for this analysis because horizontal gene transfer has occurred for billions of years between the ancestors giving rise to all three domains. A. true B. false
In Drosophila, a mutation in a gene for a bicoid transporter gene could result in which of the following?
A. offspring with no head B. offspring with no spiracles C. offspring with two heads and no spiracles D. offspring with the location of the head and spiracles reversed E. offspring with no head and two spiracles
The cell junctions labeled “A” in the figure
a. prevent movement of materials between cells. b. are found in tissues subjected to stretching. c. allow the free passage of materials between cells. d. are found mostly in heart muscle. e. are found in most tissues except in the stomach.
Mutations in germ cells are passed on only to other germ cells in members of future generations
a. True b. False