Which of the following cell types are alive in mature tissue? Choose all that apply
a. collenchyma cells d. tracheids
b. sieve tubes e. companion cells
c. vessel members f. sclerenchyma cells
A, B, E
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Alternate forms of a gene are called ____
a. homologues b. loci c. alleles d. homozygous e. heterozygous
What is alternative RNA splicing?
a. a mechanism for cleaving RNA into progressively smaller pieces for disposal b. a mechanism for patching together multiple RNA transcripts to form large and complex instructions for quaternary level proteins c. a mechanism that allows different protein products to be produced from one gene when different exons are combined to form the mRNA d. an out of control splicing mechanism only seen in cancerous cells
Compare and contrast the functions of the adrenal cortex and the adrenal medulla. In what way are they similar? In what way to the hormones produced differ in terms of their chemical structure and how their levels are controlled?
What will be an ideal response?
In temperate deciduous forests, the greatest concentration and diversity of life occur in the canopy
Indicate whether the statement is true or false