Exam 1 Fall 2017 Flashcards
A polar covalent bond:
A) causes one atom to have a slightly positive charge and the other atom to have a slightly
negative charge
B) occurs when electrons are shared unequally
C) can cause a molecule to be hydrophilic
D) all of the above
d
Active transport of a molecule across the cell membrane requires energy because:
A) it causes a break in the cell membrane
B) the molecule has to be broken down first
C) the molecule is moving from an area of high concentration to one of low concentration
D) the molecule is moving from an area of low concentration to one of high concentration
E) the molecule is hydrophobic
d
DNA acts as a template. The strands of DNA must be separated so that:
A) The bases are free to form hydrogen bonds with amino acids.
B) The bases are free to form covalent bonds with amino acids.
C) The bases are free to form hydrogen bonds with other nucleotides.
D) The bases are free to form covalent bonds with other nucleotides.
c
A scientific theory is:
A) likely to be disproved by new evidence.
B) a speculative idea or unproved assumption.
C) a scientific explanation that remains untested.
D) not well supported by prior tests and observations.
E) a conceptual framework that explains existing facts.
e
The phosphate groups in ATP:
A) are covalently bonded to each other
B) represent a significant source of stored energy
C) are negatively charged
D) release energy when separated from the rest of the molecule
E) all of the above
e
\_\_\_ is transcribed into \_\_\_\_ which is translated into \_\_\_\_. A) DNA; RNA; protein B) RNA; DNA; protein C) DNA; protein; RNA D) Protein; RNA; DNA E) Protein;DNA;RNA
a
Transcription continues until:
A) all bases in the DNA are copied
B) a stop codon is encountered
C) a terminator sequence is encountered
D) a ribosome pulls RNA polymerase off the DNA
E) a release factor blocks the RNA polymerase from continuing to read the DNA
c
Glucose is broken down and converted to ATP during cellular respiration. As glucose is broken down, how does the potential energy of glucose change?
A) The potential energy of glucose decreases as it is broken down.
B) The potential energy of glucose increases as it is broken down.
C) The potential energy of glucose stays the same as it is broken down.
a
The scientific method begins with: A) a hypothesis B) a critical experiment C) observations D) predictions E) theory
c
A template DNA strand has the sequence 3’-ATGCTG-5’. The corresponding RNA will have the sequence:
A) 5’-TACGAC-3’
B) 5’-CAGCAT-3’
C) 5’-UACGAC-3’
D) 5’-CAGCAU-3’
c
Enhancers:
A) help to control when a gene is transcribed
B) have to be removed from the RNA before it is translated
C) are a type of protein
D) identify an RNA as being mRNA
a
In a scientific experiment, a control group _______.
A) is less important than an experimental group
B) is used for comparison with the experimental group
C) makes the experiment better, but is not essential
D) all of the above are correct
b
What happens to the electrons in an ionic bond?
A. Valence electrons from one atom are donated to another atom.
B. Electrons are shared equally between two or more atoms.
C. Electrons are shared unequally between two or more atoms.
D. An atom in one molecule is attracted to a more electronegative atom in another molecule.
a
Which of the following is true about hydrogen bonds?
A. A hydrogen atom donates an electron to another atom.
B. A hydrogen atom attached to an electronegative atom in one molecule is attracted to an electronegative atom in an adjacent molecule.
C. A hydrogen atom creates a covalent bond with another atom.
D. A hydrogen atom inherits an electron from another
atom.
b
Where does photosynthesis occur?
In chloroplasts (specifically in plant leaves)
