The ___ part of the cell membrane functions as a barrier while the ___ does most of the transport.

a. Carbohydrates; Lipids

b. Glycoprotein; lipids

c. Glycogen; protein

d. Lipids; Proteins


d. Lipids; Proteins

Biology & Microbiology

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Were there any eukaryotic cells on Earth 1.5 billion years ago?

A. No, they do not appear in the fossil record until around 1 million years ago. B. Yes, they first appear in the fossil record around 1.8 billion years ago. C. No, they do not appear in the fossil record until around 500 million years ago. D. Yes, they first appear in the fossil record around 3.5 billion years ago.

Biology & Microbiology

Which one of the following forms of birth control is effective over the longest period of time?

A) IUD B) hysteroscopy C) cervical cap D) condom E) spermicide

Biology & Microbiology

The endogeneity problem that results from when a variable correlated with the treatment is not included as a control variable is known as the:

A. instrumental variable. B. weak instruments problem. C. omitted variable bias. D. least efficient estimator.

Biology & Microbiology

The collection of bacteria that live on and within the human body are being isolated, identified and characterized; they are referred to as the human ______. It has been demonstrated that these organisms differ based upon the age, diet, geography and state of health of the human from which they were obtained.

A) macrobiome B) homobiome C) metagenome D) microbiome E) minibiome

Biology & Microbiology