Which of the following is a current approach for determining the features of the last universal common ancestor (LUCA) (select all correct choices)?

A. Delete genes one by one in a simple DNA virus and determine which genes are essential for infection.
B. Assemble a list of genes and other features that are currently shared by plants, animals, and bacteria.
C. Assemble a list of genes and other features that are currently shared by cells representing the three domains.
D. Define the minimum set of genes necessary to support a simple cell.
E. Define the minimum set of genes necessary to support an archaeal cell.


C, D

Biology & Microbiology

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On a very hot summer day and a few months later on a very cold winter day, you go outside and take your

temperature. Each time your body temperature is 37 degrees Celsius. This example illustrates ____.

a. adaptation b. cellular reproduction c. respiration d. homeostasis e. digestion

Biology & Microbiology

Aristotle’s ideas on the natural world greatly influenced ____, who believed that the “great chain of being” extended

from ____.

a. Asian beliefs; lifeless forms to humans b. Hindu systems of thought; plants to spiritual beings c. tribal beliefs; lifeless forms to spiritual beings d. later European thinkers; plants to spiritual beings e. Thomas Malthus’ treatise on population; lifeless forms to mammals

Biology & Microbiology

Which area of the cerebrum deals with learned patterns or motor skills?

a. Broca's area b. Wernicke's area c. prefrontal cortex d. premotor cortex e. hippocampus

Biology & Microbiology

In familial hypercholesterolemia, individuals who are homozygous for the mutation lack LDL cholesterol receptors in the liver, causing high levels of serum cholesterol

This is a defect in which type of gene pathway: a biosynthetic, signal transduction, or developmental pathway?

Biology & Microbiology