It is thought that the earliest tools were employed by hominids to:
a. assist in locomotion
b. provide protection
c. facilitate the processing of food
d. ward off predators
e. fight for territory
c
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Which curves on the graphs may represent the temperature and pH profiles of an enzyme taken from a bacterium that lives in a mildly alkaline hot springs at temperatures of 70 °C or higher?
A) curves 1 and 5 B) curves 2 and 4 C) curves 2 and 5 D) curves 3 and 4 E) curves 3 and 5
Among the dihybrid crosses below, which will produce a 1:1 phenotypic ratio?
A) AA BB × aa bb B) Aa Bb × Aa Bb C) Aa Bb × aa bb D) Aa BB × aa BB E) AA bb × aa BB
Which factor has the least effect on the amount of incoming light that strikes an area?
a. latitude b. temperature c. particulate matter in the atmosphere d. total surface area that sunlight strikes e. Earth's tilt
A plant secretes ____ when it needs to respond defensively to a pathogen.
A. salicylic acid B. systemin C. brassinosteroids D. mineralocorticoids E. nitric oxide