bio exam 1

Experiments are carried out to test a hypothesis by changing one variable at a time and including an unchanged variable termed what?

• controlled

• manipulated

• responding

• random

Dr. Ratard was trying to determine the cause of a mysterious epidemic affecting fish in the Gulf of New Mexico. His proposal that the deaths were caused by an organism called a protist is considered what?

• hypothesis

• theory

• law

• prediction

What is the process by which RNA is made from DNA?

• replication

• translation

• transcription

• mutation

In DNA, adenine always pairs with which base?

• cytosine

• guanine

• thymine

• uracil

A gene is best described as which of the following?

• a segment of DNA that codes for a protein

• a carbohydrate that stores energy

• a lipid that forms cell membranes

• a sequence of RNA that provides cellular energy

Which sugar is found in DNA?

• ribose

• deoxyribose

• glucose

• fructose

A scientific theory is which of the following?

• a guess that has not been tested

• a concept that is supported by experimental evidence that explains facts in an area of study

• a single observation made during an experiment

• a law that never changes

Decomposers: photosynthesizing organisms are any kind of green plant. Green plants make their food by taking sunlight and using the energy to make sugar. The plant uses this sugar, also called glucose, to make many things, such as wood, leaves, roots, and bark. Is this statement true or false?

• True

• False

Tissue is the basic unit around which an organism is organized. Is this statement true or false?

• True

• False

You explain to your study group that a hypothesis is which of the following?

• a prediction without evidence

• an explanation that accounts for careful observations

• a proven scientific law

• a set of unrelated facts