A layer of endodermal cells around the vascular cylinder deposits a waterproof band called a(n) __________ in their abutting walls.

Fill in the blank(s) with the appropriate word(s).


Casparian strip

Biology & Microbiology

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While there are 64 codons in the genetic code, they encode only ____ amino acids

a. 60 b. 20 c. 12 d. 24 e. 44

Biology & Microbiology

There is an ozone "hole" over:

a. the Northeastern United States b. Western Europe c. Antarctica d. Central America e. North Africa

Biology & Microbiology

Potassium ion channels open ____, resulting in ____

a. as the action potential passes down the axon; a more negatively charged axon cytoplasm b. when the threshold potential is reached; the opening of more sodium channels c. during the resting potential; the diffusion of sodium ions into the axon cytoplasm d. when the action potential reaches the axon terminal; a more positively charged axon cytoplasm e. when neurotransmitters attach to dendrite receptors; no difference in the charge of the axon cytoplasm

Biology & Microbiology

The following regression results are from the first stage regression of Price on income and wholesale costs-which is serving as the instrument for a particular grocery product across different markets: Pricei = 3.2(1.0) + 4.3(0.8)WholesaleCostsi + 5.5(2.7)Incomei, where standard errors are reported in parenthesis. What conclusion can be drawn about the instrumental variable?

A. It's under reporting the effect of income on price. B. With a t-stat over 2.5 (4.3/0.8), the instrument is exogenous. C. It's unbiased. D. With a t-stat over 2.5 (4.3/0.8), the instrument is relevant.

Biology & Microbiology