In the life cycle of vascular plants, a
gametophyte forms from a
a. zygote.
b. sporophyte.
c. gamete.
d. spore.
e. zygote and a gamete
D
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In the process of molecular cloning, which of the following cuts DNA double strands so that they have sticky ends?
a. restriction enzyme b. recombinant protein c. plasmid d. codon
The entire duration of a person's life is referred to as ________
Fill in the blank(s) with correct word
What is required for facilitated diffusion to take place?
a. energy from ATP b. a transmembrane protein c. the transport of large food particles d. the transport of small nonpolar molecules e. movement down a concentration gradient
A pea plant that is heterozygous for the flower color gene makes gametes. What is the probability that a specific gamete contains the recessive white allele for flower color?
a. 0 percent b. 25 percent c. 50 percent d. 75 percent e. 100 percent