BIOL-1031 Exam 1

The volume of a nut was measured as 2.1 mL. In a science lab, this can also be recorded as _______

0.0021L

The diameter of the sample below is _________________ or _____________

2 cm or 20 mm

The meniscus indicates the correct volume of the sample in the figure is________

21 mL

As part of the Covid-19 screening, a student's temperature was taken at the start of the school day. The reading indicated 37.4 degrees. The student is placed in isolation and asked to leave, quarantine, and seek medical check up. This temperature was measured in _______________

Celcius degrees

If the hypothesis in a scientific experiment is not supported, the experiment is considered a complete failure and must be repeated until a satisfactory outcome is reached.

False

What is the purpose of a control group in scientific experiments?

The control group undergoes standard or no treatment and serves as a baseline for a group receiving an experimental treatment.

Measuring the volume of an odd-shaped small item will be best accomplished by adding a determined amount of water to a graduated cylinder, then placing the item into the graduated cylinder. The volume of the item is ______

The difference between the initial and final volume

A friend gave you some peppers and tomatoes from his garden. After a week you notice the tomatoes that you left on the counter by the bananas you had are very ripe and must be consumed or cooked soon. This is an example of _______

an observation

Organic compounds and hydrocarbons both have diverse molecules. The hydrocarbons are different in that all hydrocarbon molecules are hydrophobic and

chains of only carbon and hydrogen atoms

When using the scientific method, the kind of variable that will be measured in response to the variable manipulated (or treatment applied) is the ______variable. In the pill bugs experiment this variable that was measured in response to the treatment was _______.

dependent ---number of pill bugs on each side of the chamber

When washing your hands you should....

scrub for for about 20 secs, and clean even under nails

The positive control used in the Iodine test was the test tube with __________

starch solution

Polysaccharides such as starch and glycogen are made up of glucose and their role is___________________.

store long-term energy

One of the lab safety regulations includes

using closed, non slippery shoes

In the pillbug experiment, your hypothesis

was related to the food pillbugs prefer

In a test for lipids a drop of each test substance was placed on a square of brown paper. After 30 min the spot from the bottle sample that contained oil, was there. The paper that had distilled water was almost dry. Of the other two substances, one still was showing a spot, though not large and the last one was showing a little white residue . The spot that was still showing a faint spot most likely is ___________________

milk

The building blocks of carbohydrates are____

monosaccharides

Imagine that you wish to compare two different diets that will be fed to tadpoles raised in a lab. One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. You want to see if the meat-based diet will be associated with an increase in the average weight of the tadpoles. In your experiment you keep all other factors, such as tadpole density per pan, temperature, pH, and the amount of food the same. The only difference between your control and experimental groups is the type of food the tadpoles receive. Which is a good hypothesis for this tadpole experiment?

There will be a difference in the size of the tadpoles, Tadpoles fed a meat-based diet will weight more than tadpoles in lettuce-based diet. have a higher increase in size co

The image shows a Benedict test for reducing sugar. What is the conclusion after observing this result?

a complex sugar is present in the test tube

After a Biuret test was performed , the test tube on the right side with the color change to lavender indicates positive result and it is ________

albumin

The building blocks of that make proteins are the _____ ______

amino acids

The negative control used in the Benedict's test was

distilled water

____________ are hydrophobic molecules that may be solid or liquids at room temperature.

fatty acids

A scientist that studies birds (ornithologist) is tracking migratory hummingbirds, Upon capturing the birds they are carefully placed in a bag to weight them and then banded. The weight will be recorded as _____ using a _______________

grams ---- electronic balance

One reason to wash your hands before and after a lab exercise, is your hands may

have been in contact with pathogens (infectious organisms) and dangerous chemicals