The basic unit of life is the ________

Fill in the blank(s) with correct word


cell

Biology & Microbiology

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You are given a sample of an unknown food. Describe how you would test it for the presence of lipids.

What will be an ideal response?

Biology & Microbiology

How does the phenomenon of horizontal gene transfer muddle the concept of monophyletic groups?

A. Horizontal gene transfer makes it impossible to distinguish monophyletic groups. B. Monophyletic groups are based on the concept that a particular group of species descended from a common ancestor. When horizontal gene transfer occurs, not all of the genes in a species were inherited from the common ancestor. C. Since horizontal gene transfer includes transfer from one group of species to another group with a common ancestor, there is no muddling of the concept of monophyletics. D. All of these are correct.

Biology & Microbiology

Both walnut and Gingko trees lose their leaves in the fall when day length starts decreasing. Based on these observations, one may conclude that many tree species will lose their leaves in the fall in response to decreasing day length. This statement is an example of

A. a theory. B. an experiment. C. inductive reasoning. D. deductive reasoning.

Biology & Microbiology

Suppose you are trying to estimate the following regression: Yi = ?0 + ?1X1i + ?2X2i + ?3X3i + Ui, with an instrument for Zi for X2i. All of the following variables will be included (on the right- and left-hand side of this regression) in the second stage of two-stage least squares except for which one?

A. Yi B. X2i C. X3i D. X1i

Biology & Microbiology