Which of the following is NOT true concerning the
root endodermis?
a. It regulates the movement of water and minerals
into the vascular cylinder.
b. It contains a water-impermeable waxy strip.
c. It is a layer of cells surrounding the vascular
cylinder.
d. It forces water to move through its Casparian
strip.
e. It separates the vascular cylinder from the cortex
of a root.
Answer: d
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What will be an ideal response?
After two weeks collecting the blood from mosquitos in the Australian outback, scientists arrive back at the lab to discover that their sequencing will not succeed because there is a large amount of RNA mixed with the DNA in their samples. How might they quickly distinguish the DNA from the RNA in these samples?
a. The DNA will be single-stranded with a deoxyribose sugar and thymine. The RNA will be single-stranded with a hexose sugar and uracil. b. The DNA will be double-stranded with thymine but no sugar. The RNA will be single-stranded with a ribose sugar and uracil. c. The DNA will be double-stranded with a deoxyribose sugar and thymine. The RNA will be single-stranded with a ribose sugar and uracil. d. The DNA will be double stranded with a deoxyribose sugar and uracil. The RNA will be single-stranded with a ribose sugar and thymine.
Inbreeding is less likely to produce offspring that are homozygous for a harmful recessive trait.
a. true b. false
Cl + e- ? Cl- is an example of a:
A. ionization. B. oxidation. C. polymerization. D. reduction.