BIO 1050 EXAM 1

Kevin is studying predator-prey interactions. One day he notices a spider eating a cricket caught in its web. Later that day, a bird eats the spider. how many producers are there in this scenario?

0

which molar concentration of [H+] shown below represents a strong base

10^-13

in which of the following is the correct monomer matched with its polymer?

amino acid- protein

all atoms of the same element have the same

atomic number

mitochondria are found in

both plant cells and animal cells

a systematic binomial name indicates the ______ of the organism

genus and species

an atom that has an electrical charge is called a(n)

ion

why is evolution an important process for living things?

it gives them traits that better match their environment

what category of biological molecules are steroids included in?

lipids

which of the following correctly lists the classification categories from least to most inclusive?

species, genus, family, order, class, phylum, kingdom, domain

A cell being observed under a microscope is seen to possess a cell wall, plasma membrane, ribosomes and chromosome materials that are not found in a nucleus. Based on this, it could be

a cell from a bacterium

information collected from a scientific experiment is known as _________

data

a covalent bond occurs when

electrons are shared between two atoms to complete their octets

a polypeptide forms a pleated sheet or a helix as it tertiary structure

false

animals store carbohydrates in the form of starch

false

fruits and vegetables contain more saturated fats then meats

false

plant cells have walls but do not have plasma membranes

false

the smallest unit of life is an atom

false

a water molecule is polar because of

unequal sharing of electrons

DNA and RNA differ in that

DNA is double stranded, contains the sugar deoxyribose and the nitrogen containing base thymine while RNA is single stranded, contains sugar ribose and the nitrogen containing base uracil

a solution has a pH of 3.5. this means that it has an excess of ______________ ions and would be called a(n)________________

H+ ; acid

the four main categories of organic macromolecules are

carbohydrates, lipids, proteins, and nucleic acids

which of the following lists the terms from simplest to most complex?

cells, tissues, organs, organ systems, oraganism

in a dehydration reaction, ________. in order for this to occur water is ______.

monomers are joined to become a polymer; removed

Richard is an avid gardener who spends a lot of time caring for the plants in his garden. To minimize damage from pests from his garden, Richard uses a pesticide spray. At first the spray is very effective and kills off most of the insects that he sees on his vegetable plants. However, after a few years of using the same pesticide he notices that some insects are surviving and continuing to eat his plants. this selection for herbicide resistance in the insects is an example of

natural selection

there is an antibiotic called streptomycin that doctors prescribe for infection. The antibiotic combines with the bacteria's ribosomes causing them to lose their function. Consequently the cell dies and so the person gets better! In other words, the antibiotic destroys bacteria by

not allowing them to produce proteins

ATP is a molecule used for energy transport inside the cell. The components of it are a nitrogen containing base, a pentose sugar and three phosphate groups. Given this structure it is a(n)

nucleic acid

resolving power in a microscope is

the ability to tell two points apart as separate points

the pH scale is a mathematical indicator of

the concentration of H+ present in a solution

chemical bonds involve

the giving, taking or sharing of electrons

the reactivity of an atom depends on

the number of valence electrons

which of the following best describes the structure of how water molecules form and interact?

the oxygen atom and hydrogen atoms form a covalent bond with one another to create stable outer shells of electrons. the electrons are shared unequally resulting in a polar molecule whose slight charges form weak hydrogen bond attractions with other water molecules.

in sickle cell disease, malformation of red blood cells is caused by only one mistake for one amino acid in the genetic code for hemoglobin

true

the electron arrangement for argon, which has 18 electrons is

2 in the inner energy shell, 8 in the second energy shell and 8 in the outer energy shell

which of the following would be an example of the value of water's heat capacity?

living organisms are better able to maintain their internal body temperature because the temperature of their environment changes very slowly

isotopes of an atom differ in their atomic mass

true

the development of new technologies is based upon science

true

the plasma membrane's hydrophilic part faces the outside of the cell and the cytoplasm

true

the shape of a protein is a critical factor in its function

true