Multiple Choice
Which vitamin is primarily responsible for aiding calcium absorption and promoting bone health in the human body?
19
views
1. Introduction to Biology
Introduction to Biology
Struggling with General Biology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following did all protocells have in common?
A
A surrounding membrane that separated internal contents from the environment
B
A fully functional nucleus containing DNA
C
Complex organelles such as mitochondria
D
The ability to perform photosynthesis
Verified step by step guidance1
Understand the concept of protocells: Protocells are simple, primitive structures hypothesized to be precursors to modern cells. They are not fully developed cells and lack complex organelles or a nucleus.
Identify the key feature of protocells: Protocells are thought to have had a surrounding membrane, which is essential for separating internal contents from the external environment and maintaining homeostasis.
Eliminate options that require advanced cellular structures: Protocells did not have a fully functional nucleus containing DNA or complex organelles like mitochondria, as these are features of more evolved eukaryotic cells.
Consider the ability to perform photosynthesis: Photosynthesis is a complex biochemical process requiring specialized structures like chloroplasts, which protocells did not possess.
Conclude that the common feature of all protocells was a surrounding membrane, as this is the simplest and most fundamental characteristic necessary for the formation of life-like structures.
1:28mWatch next
Master Introduction to Biology Channel with a bite sized video explanation from Jason
Start learningRelated Videos
Related Practice
Introduction to Biology practice set
Problem sets built by lead tutorsExpert video explanations