1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
hodyreva [135]
3 years ago
8

Why is a longitudinal study better than a cross-sectional study for examining how many years cancer survivors stay in remission?

Biology
1 answer:
Liono4ka [1.6K]3 years ago
7 0
<span>A cross-sectional study examines all of the participants at one time. So for a cross-sectional study of cancer survivors, we would gather some sample of former patients and find out how long they have been in remission.

The problem with that cross-sectional design is we would be missing the people whose cancer had returned and caused them to die before our experiment started; we would have introduced a problem called "survivor bias" by only counting people who were STILL in remission and still alive.

A better experiment will use a longitudinal design of enrolling people whose cancer has just gone into remission, and following them to see how long they stay healthy.</span>
You might be interested in
Which is a density-independent factor in controlling a population? A. Floods B. Access to light C. Water supply D. Predators
Alla [95]
I think it is A. Floods.
6 0
3 years ago
A coconut is falling from a palm tree. According to the model above, when does the coconut have the most potential energy
erastova [34]

Answer:

When it is in position one because it gathers all the energy to fall and slowly gets faster.

8 0
3 years ago
15. When there is light, plants do which of the following biological<br> processes?<br> *
zhuklara [117]

Answer: Plants do both photosynthesis and cellular respiration.

Explanation:

All cells do cellular respiration even without light.

Honestly, photosynthesis alone would be right since the teacher didnt  state the questions correctly. But you should choose both cause in the light it does both.

6 0
3 years ago
What type of biomolecule (lipid, protein, nucleic acid, or carbohydrate) is chlorophyll?
choli [55]
Chlorphyll is not any of the listed biomolecules, but it is most closely related to carbohydrates as it contains Carbon, Hydrogen, and Oxygen. Chlorophyll is actually a pigment that absorbs light
3 0
3 years ago
4. A polypeptide has the following amino acid sequence: Met-Ser-Pro-Arg-Leu-Glu-Gly In the mutant below, indicate the type of mu
MatroZZZ [7]

Answer:

4. c. Deletion/ frameshift mutation

5. a. Tyr Tyr Asp Ser Gly

6. A frameshift occurred which altered the identity of the amino acids following the initiator 6. methionine, but not the length of protein Q.

Explanation:

4)

A single base pair at the first position of the Arg codon i.e. CGA has been deleted. Due to the deletion, the reading frame has shifted one nucleotide backwards, altering the amino acid sequence of the protein.

5)

The genomic DNA sequence is 5'-ATG ATA CTA AGG CCC-3'. Therefore, the complementary mRNA will be 5'-UAC UAU GAU UCC GGG-3'. According to the genetic code, this mRNA sequence encodes the following amino acid sequence: Tyr Tyr Asp Ser Gly

6)

The wild type DNA sequence is:

5'-ACUGUAAUGGAGUCAGAUGAUGCAUUAAGGAGAAAUUGAAAUAAA-3'

The mutant i.e. mRNA with the added G will be

5' ACUGUAAUGGGAGUCAGAUGAUGCAUUAAGGAGAAAUUGAAAUAAA-3'  

This is a single base pair insertion and frameshift mutation that shifts the reading frame one base pair forwards. The codon that was originally GAG coding for glutamic acid (Glu) gets converted to GGA that codes for glycine. Therefore, the amino acid sequence has been altered but the polypeptide chain will still have 13 amino acids.

6 0
3 years ago
Other questions:
  • What is the main function of any organisms reproductive system
    11·2 answers
  • Which element is found in proteins and nucleic acids but not in carbohydrates
    7·1 answer
  • what are the two modes through which the hypothalamus causes the release of hormones by pituitary gland?​
    14·1 answer
  • Las plantas verdes durante la fotosintesis capturn y liberan​
    7·1 answer
  • An embryologist is looking at a cross-section of a mouse embryo. she notices that flanking either side of the neural tube (the r
    6·1 answer
  • Which of the following pairs is most closely related?
    7·1 answer
  • I NEED AN HONEST ANSWER, PLS HELP!
    9·2 answers
  • Which statements accurate describe tropical rain forest
    15·2 answers
  • :-) :-) :-) :-) :-) :-) :-) :-) :-)
    11·1 answer
  • Help please! need ans in 3 minutesss
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!