Chromosomes are attached to the nuclear envelope by
a. centromeres.
b. telomeres.
c. origins of replication.
d. nuclear lamin genes.
e. Both a and b
Ans: d. nuclear lamin genes.
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Using the drawing of mRNA below, choose the letter that best fits the description. Translation is often regulated by sequences in this region. ____
What will be an ideal response?
Nitrogen fixation:
A. is necessary for the electron-transport chain because nitrogen acts as the final electron acceptor. B. incorporates molecular nitrogen (N2) taken from the air into amino acids and nucleotides. C. releases N2 gas to the atmosphere. D. converts N2 to ammonia, making it available for incorporation into amino acids and nucleotides. E. is carried out by biochemical pathways in the plant cells.
The KlamathâSiskiyou forest in southwestern Oregon and northwestern California is home to many rare conifers, two
endangered birds, and the endangered Coho salmon. Because of this, it is considered to be a conservation _____.
a. hot spot b. endangered region c. national park d. island e. ecoregion
On the phylogenetic tree of primate evolution, where do you find the first primates to diverge from the common ancestor of the primates?
A. No. 1 B. No. 4 C. No. 5 D. No. 6 E. No. 7