Brown algae lack true roots but have similar structures called ____ that anchor them to their substrate
a. stipes
b. blades
c. holdfasts
d. thalli
e. rhizoids
C
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Rosalind Franklin's X-Ray diffraction images taken in the 1950s most directly support which of the following claims about DNA?
A) The ratio of base pairs are constant. B) The nucleotide sequence determines genetic information. C) The two strands of DNA are anti-parallel D) The basic molecular structure is a helix
Carbohydrates and fats are considered high-energy foods because they _____
A) have a lot of oxygen atoms. B) have no nitrogen in their makeup. C) have a lot of electrons associated with hydrogen. D) are easily reduced.
________ describes the number of individuals at each trophic level multiplied by their dry weight
Fill in the blank(s) with correct word
"Engaging in aerobic activity three times each week will reduce cholesterol levels" is a:
A) substantiated explanation. B) testable hypothesis. C) scientific control. D) critical experiment. E) null hypothesis.