Biology most missed questions
Esch of the following requires 12 carbon atoms. Which of the arrangements of carbon atoms has the greatest entropy? 12 molecules of carbon dioxide, CO2
12 molecules of carbon dioxide, CO2
The phenotypic ratio resulting from dihybrid cross showing independent assortment is expected to be
9:3:3:1
A phenotypic trait, like yellow pea color, cannot be the dominant trait, if the opposite trait, green pea color, is observed more in nature
False
Most diseases are a result of
Genetics and the environment
Which of the following mutations usually has the least impact on an embryo?
The mutation of a single gene
Which of the following is false?
The hybrid offspring of a cross are the P1 generation
Which of the following is not a function of membrane proteins?
all of the choices are correct
Which of the following is an energy requiring mode of transport that brings substances into a cell?
osmosis
Which of the following groups can link 2 organic building blocks into larger structures (as in DNA) and participates in reactions that conserve and release energy?
phosphate group
Which of the following groups contain the base molecule that is crucial to the structure and function of the sex hormones estrogen and testosterone?
lipids
Which functional group is non polar?
methyl group
A glycosidic linkage forms between which of these group?
monosaccharides
As shown in ht figure, the top(straight) triglyceride has ____, whereas the bottom(crooked) triglyceride has ____.
no double bonds and is saturated; double bonds and is unsaturated
DNA carries genetic information in its
sequences of nitrogenous bases
If a disease is an X-linked dominant gene causes a liver disorder, what are the chances that the son of a healthy woman and an afflicted man will have the disease?
0%
You conduct a dihybrid cross (result:YyRr) and then test cross the generation. A ___ ratio would make you suspect that the genes are not linked
1:1:1:1
In a typical human body cell, how many sex chromosomes are there?
2
What is a test cross?
A mating between an individual of unknown genotype and an individual homozygous recessive for the trait of interest
When Mendel used true breeding white flowers and true breeding purple flowers as the parental generation, what were the results of the first generation?
All the offspring had purple flowers
The fiber in your diet is actually
cellulose
You are told that the cells on a microscope slide are plant, animal, or bacterial. You look at them through a microscope and see cell wells and membrane bound organelles. You conclude that the cells
Are plant cells
Certain vitamins, such as niacin, act as ___ in enzyme catalyzed reactions in helping the enzyme work properly
Coenzymes
When genes are linked, a few of the recombinant genotypes still occur in the offspring because of:
Crossing over
All of the following statements pertaining to enzymes are type except:
Enzymes increase activation energy requirements
Which of the following correctly matches an organic polymer with its monomers, respectively?
DNA; nucleotides
Living systems
Decrease their entropy while increasing the entropy of the universe
The cholesterol associated with cell membranes
Decreases fluidity of the membrane at warm temperates
Which of the following is false?
Enzymes are used up in chemical reactions
A human sperm cell possesses autosomes and:
Either an X or a Y chromosome
Genes located close together on the same chromosome are referred to as ___ genes and generally ___
Linked; do not sort independently during meiosis
All of the following statements about genotypes and phenotypes are true except:
Matings between individuals with dominant phenotypes cannot produce offspring with recessive phenotypes
Which of the following does not enhance genetic diversity?
Mitosis of somatic cells
According to the law of segregation:
Pairs of alleles separate during the formation of gametes
Which of the following terms refers to the situation where a single phenotypic characteristic is determined by the additive effects of two or more genes?
Polygenic inheritance
Crossing over occurs between
Sister chromatids of homologous chromosomes
The energy requires to initiate an exergonic reaction is called
The energy of activation
Which one of the following processes is an anabolic pathway?
The synthesis of glucose from carbon dioxide and water
Which of the following provides evidence that mitochondria and chloroplasts were one free living prokaryotic organisms?
They contain their own DNA
Facilitated diffusion across a biological membrane requires ___ and moves a substance ___ its concentration gradient
Transport proteins; down
As cell size increases, the
Volume increases faster than the surface area
Which of the following combination of sex chromosomes would not lead to a viable zygote, but instead spontaneously abort?
Y
Resolving power is the
ability of an optical instrument to show two close objects as operate
What functional groups are found in all amino acids?
carboxyl and amine
The type of bonds that occurs between monomers of a polymer is a/n
covalent bond
Which the membrane proteins helps to maintain the membrane potential?
electrogenic pump
Most animal cells are
embedded in an extracellular matrix
What maintains the secondary structure of a protein?
hydrogen bonds between the backbone components
A null hypothesis
is the premise that no difference exists between a treatment and control group
Which of the following is not a true statement about diffusion?
occurs when particles spread from areas where the are less concentrated to areas where they are more concentrated
Enzymes are ____ that orchestrate chemical reactions within the body
proteins
Collagen and hemoglobin are examples ____, whereas glucose and cellulose are examples ____.
proteins; carbohydrates
Which of the following is not a component of the endomembrane system?
ribosomes
The bonds joining 2 nucleotides within a single strand of DNA form between
sugar and phosphate group
Which of the following is an example of hydrogen bonding?
the bond between O of one water and H of a second water
